The Province of Grosseto completely occupies the southern end of Tuscany, and with a territorial area of , it is the most extensive in the region and one of the least dense in population in Italy. The province is bordered to the northwest by the
Province of Livorno, to the north by the
Province of Pisa, to the northeast by the
Province of Siena, and to the southeast by the
Province of Viterbo in
Lazio. To the south is the
Tyrrhenian Sea, which includes the southern islands of the Tuscan archipelago, including
Isola del Giglio and the smaller
Giannutri islands and
Formiche di Grosseto and Formica di Burano. The
Arcipelago Toscano National Park spans both the provinces of Grosseto and Livorno, and includes the seven main islands of the Tuscan Archipelago:
Elba, Isola del Giglio,
Capraia,
Montecristo,
Pianosa, Giannutri,
Gorgona, and some of the minor islands and rock outcrops. The highest point in the park is
Mount Capanne, at in elevation, on the island of Elba. The
Colline Metallifere (Metalliferous Hills) line the border in the south with Lazio, and contain the Natural Park of
Maremma, that protects also some of the remainings of the large swamps that once covered the area. Other protected areas are the Diaccia Botrona marshland. The principal rivers are the
Ombrone,
Fiora,
Albegna,
Pecora,
Bruna,
Merse, ,
Farma and
Chiarone. The coastline between the
Gulf of Follonica and the mouth of the Chiarone is dominated by blue waters and pine forests, and is home to resorts such as
Marina di Grosseto,
Principina a Mare,
Castiglione della Pescaia,
Punta Ala,
Puntone di Scarlino and
Talamone. Lakes include
Lago dell'Accesa,
Lago di Burano,
Lago di San Floriano and
Lago Acquato. Also of note is the volcanic cone of
Mount Amiata,
Bandite di Scarlino (213 m), Promontorio di Punta Ala e delle Rocchette (350 m), Monti dell'Uccellina (417 m), Monte Argentario (635 m), and Promontorio di Ansedonia (113 m). ==Government==